Week 5- Depth Perception Flashcards
What is pictorial?
Relating to a picture
What does visual mean?
That the info comes purely from the retinal image
What is oculomotor
Info comes from eye muscle signals
What is ordinal vs metric?
Ordinal- order, metric is number
When eyes are lateral, what happens
Eyes are on each side of the head. Visual fields overlap only minimally.
What animals have frontal eyes?
Predators. Visual fields overlap considerably
What are the pros of frontal eyes?
Binocular Summation Two chances to see the object Lower thresholds (detection/discrimination) Depth Perception Two separate viewpoints Allows us to extract depth information
What are the cons of frontal eyes?
Reduces total visual field
What is vergence?
the simultaneous movement of the pupils of the eyes towards or away from one another during focusing.
Where do fixated objects fall?
Into our fovea
How is vergence used?
to calculate the depth of a fixated object through the angular position of each eye
For long distances, what will the vergence be?
Vergence angle will be small
For long distances, what will the vergence be?
large
What is stereopsis?
Binocular visual cues to depth
Who is the father of stereostopic vision?
Wheatsone
He noticed the difference in the retinal position of objects in the two eyes signal depth
What is another word for binocular disparity?
Retinal disparity or binocullar parallex, stereopsis
What is binocular disparity
For any two objects at different depths, the relative position of their images is different in the two eyes
Describe binocular disparity by using visual cues
Binocular, Non-pictorial, Visual, Metric
What is the horopter?
A line of all possible locations where an objects half-images fall on corresponding points.
Defines locations at which objects have zero disparity
If anything is nearer than the horopter, what do they have?
crossed disparity
If anything is further than the horopter, what do they have?
Uncrossed disparity
What is Panum’s fusional area?
Zone around the horopter where single vision occurs. It combines locations of the two objects and has good metric depth.
Outside of Panum’s fusional area, what happens?
Diplopia, when you see two unfused images
